Bahmni-package doubt

So I was checking out the Bahmni package repo to check how bahmni-playbooks gets copied in the machine and I found out that there is this task: https://github.com/Bahmni/bahmni-package/blob/e44d380e3b63afe819dfb0e0c5125c19020cc65e/bahmni-installer/build.gradle#L8

It refers to the bahmni-package.zip file. My question is where is the .zip file coming from? I dont see it mentioned anywhere else.

I had made some custom changes to the playbooks and wanted the installer to pick my custom playbooks